Paste composition for front electrode of solar cell and solar cell using the same
a technology for solar cells and compositions, applied in the direction of metal/alloy conductors, conductors, conductors, etc., can solve the problem of difficulty in ensuring the electrode pattern property of a certain degree, and achieve the effect of decreasing the width of the front electrode, increasing the aspect ratio, and decreasing the resistance of the front electrod
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example 1-4
[0091]A silver precursor solution was prepared with the composition and contents of the following Table 1, and nano silver powder surface-treated with hexanoic acid was prepared by liquid phase reduction.
[0092]As a silver precursor, silver acetate (silver acetate, silverC2H3O2, silver content 68%, Junsei) was used, as a capping molecule, hexanoic acid (C6H12O2) was used (hereinafter, referred to as “C6” for convenience). In addition, as a hydroxyl group-free organic solvent, toluene was used, and as a reducing agent, hydrazine (N2H4.H2O) was used.
TABLE 1Raw materialWeight (g)silver acetate (silverC2H3O2)26hexanoic acid (C6)533Toluene800N2H4•H2O(ml / min)10
[0093]Specifically, silver acetate, C6 and toluene were added in a semi-continuous reactor to prepare a silver nano precursor solution.
[0094]Subsequently, the silver nano precursor solution was stirred while maintaining temperature of 40° C., and a reducing agent hydrazine was introduced into the silver nano precursor solution at a c...
example 5
[0097]An silver precursor solution was prepared with the composition and content of the following Table 2, and nano silver powder surface-treated with hexanoic acid was prepared by liquid phase reduction.
[0098]As a silver precursor, silver 2-ethylhexanoate (silverC8H15O2) was used, as an organic solvent, toluene was used, and as a reducing agent, sodium borohydride (NaBH4) was used.
TABLE 2Raw materialsweight(g)silver 2-ethylhexanoate (silverC8H15O2)37.65Hexanoic acid (C6)533Toluene800Sodium borohydride (NaBH4)8.5
[0099]Specifically, silver acetate, C6 and toluene were added in a semi-continuous reactor to prepare an silver nano precursor solution.
[0100]Subsequently, the silver nano precursor solution was stirred while maintaining temperature of 40° C., and a reducing agent of sodium borohydride was introduced into the silver precursor solution to prepare silver nanoparticles. In addition, as a pH control agent, butyl amine was added to the composition of Table 2 so that pH may become...
experimental example 1
[0101]The recovered particles were completely dried in a vacuum oven for 24 hours, and the particle diameter and C6 surface treatment amount were measured as follows. To measure C6 surface treatment amount, the particles were analyzed using a Thermogravimetry Analyzer and the results are described in Table 3. In addition, silver nanoparticles surface-treated with C6 were magnified 50,000-fold using transmission electron microscope, and the particle diameter of the silver nanoparticle surface-treated with C6 was measured.
[0102]In addition, change in particle diameter according to introduction speed of the reducing agent was shown in FIGS. 2 to 5. FIG. 2 shows particle diameter distribution of nano silver powder when the reducing agent was introduced at 10 ml / min according to Example 1, and FIG. 3 shows particle diameter distribution of nano silver powder when the reducing agent is introduced at 30 ml / min according to Example 2. Furthermore, FIG. 4 shows particle diameter distribution...
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